In short

Greek builds its perfect tenses the way English does: an auxiliary plus one fixed form. The auxiliary is έχω, and the fixed form always ends in -ει: έχω γράψει “I have written”, είχα γράψει “I had written”, θα έχω γράψει “I will have written”, να έχω γράψει “(that) I have written”.

The whole trick is in that -ει form. It is built from the perfective (simple) stem - the same stem you already use in να γράψω and θα γράψω - with the aorist’s extra syllable thrown away: έγραψα → γράψει, είδα → δει, ήρθα → έρθει. And it never changes: not for person, not for number, not for gender. Only έχω moves. Greek school grammars call this form το απαρέμφατο, but do not be misled by the name: it is not an infinitive, it is not a verb you can use on its own, and there is no *θέλω γράψει in Modern Greek (lesson 25 explains why Greek lost the infinitive for good).

The rule

1. The perfect (παρακείμενος): έχω + -ει. It reports a past event whose result or relevance reaches into the present: Έχω χάσει τα κλειδιά μου - I lost them, and I am still without them. It is also the tense of life experience: Έχω πάει στην Κρήτη.

2. The pluperfect (υπερσυντέλικος): είχα + -ει. Same second half, past auxiliary. It marks the earlier of two past events; the later one is normally an aorist: Όταν έφτασα, είχαν ήδη φύγει - the leaving came first, my arrival second.

3. The same -ει form after θα and να. θα έχω τελειώσει “I will have finished” (συντελεσμένος μέλλοντας), να έχω τελειώσει “(to) have finished”. Here έχω itself takes the θα or the να; the -ει form still does nothing.

4. Building the -ει form. Take the first person of the aorist, strip the personal ending and the augment, and add -ει: έγραψα → γράψει, δούλεψα → δουλέψει, μίλησα → μιλήσει. Shortcut worth memorising: the -ει form is identical to the third person singular after να. If να γράψει is correct, then έχω γράψει is correct - same letters, same accent, same spelling.

5. Perfect against aorist. The aorist puts the event inside a closed past frame, usually with a time expression: Πήγα στην Κρήτη πέρσι. The perfect refuses that frame and looks at the record so far: Έχω πάει στην Κρήτη δύο φορές. As soon as you name when, switch to the aorist.

6. Its typical companions: ήδη “already”, ποτέ “ever/never”, ακόμα (δεν) “(not) yet”, μόλις “just”, πια “any more”. Negation and weak pronouns cling to the auxiliary, never to the -ει form: δεν το έχω δει, μας το είχε πει.

This lesson covers only the active perfect. Verbs like πλένομαι or ετοιμάζομαι form their perfect differently (έχω πλυθεί, έχω ετοιμαστεί) - that is lesson 53.

Forms & patterns

Παρακείμενος (perfect) - γράφω “write”:

Υπερσυντέλικος (pluperfect) - the auxiliary goes to the past, γράψει does not move:

Συντελεσμένος μέλλοντας and να + παρακείμενος - θα and να attach to έχω:

Making the -ει form: perfective stem, augment dropped.

Notice what disappears: the augment (έ-γραψα, έ-φαγα), the stressed extra syllable of the irregulars (εί-δα → δει, εί-πα → πει, βρή-κα → βρει), and the personal ending. A few irregulars change their stem vowel instead of dropping a syllable: πή-ρα → πά-ρει, πή-γα → πά-ει. What survives is the bare perfective stem plus -ει - and every polysyllabic -ει form is stressed on the syllable right before -ει (μίλησα but μιλήσει), while the one-syllable forms δει, πει, βρει, βγει take no accent at all.

Three forms that must not be confused. Only the middle column is invariable:

The aorist carries the person; the -μένος participle carries gender, number and case (lesson 50); the -ει form carries nothing at all.

Examples

Common mistakes

• έχω γράψεις -> έχω γράψει - the -ει form never agrees with anyone; only έχω changes for person.
• έχουμε γράψουμε -> έχουμε γράψει - the same error in the plural: do not copy the ending of the auxiliary onto the second word.
• έχω έγραψα -> έχω γράψει - two finite verbs cannot stack; the augment and the personal ending both have to go.
• έχω γράψη -> έχω γράψει - a spelling trap: the ending is -ει. Test it with να: να γράψει is right, so γράψει is right.
• είχα πηγαίνει -> είχα πάει - the form is built on the perfective (simple) stem, not on the present stem.
• έχω γραμμένο το γράμμα -> έχω γράψει το γράμμα - the -μένος participle agrees and describes a state (lesson 50); the perfect tense uses the invariable -ει form.
• Έχω μείνει εδώ τρία χρόνια (meaning “and I still live here”) -> Μένω εδώ τρία χρόνια - English “I have been here for three years” becomes a Greek present, because the situation is still going on.
• Έχω πάει στην Κρήτη πέρσι -> Πήγα στην Κρήτη πέρσι - a closed past time frame takes the aorist, not the perfect.
• Έχω να γράψω δύο γράμματα for “I have written two letters” -> Έχω γράψει δύο γράμματα - έχω να + verb is a different construction: “I have two letters to write”.

Tips

• Learn one form, use it in three places: γράψει is the third person singular after να, after θα, and the second half of every perfect tense. If you can say να γράψει, you can say έχω / είχα / θα έχω γράψει.
• Say the perfect out loud as a single unit with one moving part: έχω γράψει, έχεις γράψει, έχει γράψει. Whenever your mouth wants to change the second word, stop it.
• Spelling check before you write -ει: put να in front. If «να δουλέψει» looks right, so does «έχω δουλέψει»; δουλέψη fails the test.
• Δεν and the weak pronouns go before the auxiliary, never between the two words: δεν το έχω δει, μας το είχε πει, not έχω δεν δει.
• Adverb slot: ήδη normally squeezes in between (έχω ήδη φάει, είχαν ήδη φύγει), while ποτέ and ακόμα usually follow the whole unit (δεν έχω πάει ποτέ, δεν έχει έρθει ακόμα).
• Use the pluperfect only when there are two past points and you want to mark which came first. If there is just one past event, the aorist is enough - Greek does not use είχα + -ει as a polite or literary variant of the aorist.
• Watch the second accent when a weak pronoun follows a word stressed on its third-from-last syllable: ο δάσκαλός μου έχει φύγει, το μάθημά μας έχει τελειώσει.